<link type="text/css" href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet">
<script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>



<!-- 文档地址 https://getbootstrap.net/docs/components/modal/ -->
<button type="button" id="bs-alert"  class="btn btn-primary" data-toggle="modal" data-target=".bd-example-modal-lg">
	提示窗
</button>
<div class="modal fade bd-example-modal-lg" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel" aria-hidden="true" style="font-size: 14px">
	<div class="modal-dialog modal-lg">
		<div class="modal-content">
			<div class="modal-header">
				<h5 class="modal-title">Modal title</h5>
				<button type="button" class="close" data-dismiss="modal" aria-label="Close">
					<span aria-hidden="true">&times;</span>
				</button>
			</div>
			<div class="modal-body">
				<p>Modal body text goes here.</p>
			</div>
		</div>
	</div>
</div>

<script type="text/javascript">
	//为了演示，先初始化一次点击
	$('#bs-alert').click();
</script>
